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Finding the Fourth Proportional to 642,109.52, 886,117.66 and 387,411.50

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Solution

The fourth proportional to 642,109.52, 886,117.66 and 387,411.50 is: 534,631.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,109.52 : 886,117.66 = 387,411.50 : x
  2. Step 2: Convert to fraction form
    642,109.52/886,117.66 = 387,411.50/x
  3. Step 3: Cross multiply
    642,109.52x = 886,117.66 × 387,411.50
  4. Step 4: Simplify right side
    642,109.52x = 343,292,171,837.09
  5. Step 5: Solve for x
    x = 343,292,171,837.09/642,109.52
  6. Step 6: Final answer
    x = 534,631.81

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.